Internal-combustion engine



April 5,1927. 1623386 E. R. BURTN ETT INTERNAL COMBUSTION ENGINE Filed Sent. l8. 1924 Patented Apr. 5,1927. I

Y ,UNE'EED STATES ten-see. j

' EVERETT B. BUETNETT; or Los ANGELES, CALIFORNIA, ASSIGNOR, BY arrraor AND; v

MESNE ASSIGNMENTS, 1 0 THE AUTOMOTIVE VALVES 00., or Los ATNGELES; MEL 1 FOBNIA, A VOLUNTARY TRUST.

INTERNAL-COMBUSTION ENGINE.

Application fil ed September 1a, 1924, Serial No. 738,417.

My invention relates to internal combustion engines of the general type disclosed in my coepending application for U. SQLetters Patent filed anuary 4, 1923, Serial No. 610,700.

The principal object of my present inventionis to generally improve upon'and sim- I operation;

provide an engine of the character described wherein a pair of combustion chambers are connected at their outer or upper ends by I a common combustion and expansion chamher; to arrange behind and in line with the combustion chambers a gaseous fuel pumping-cylinder; to arrange behind and in line with said umping cylinder and said combustion cy ind-ers a cylinder and a piston valve therein which piston valve controls the admission of gaseous fuel into the piston valve chamber and pumping cylinder and to connect the pistonsofthe combustion cylinders, the pumping cylinder and valve cylinder to a commoncrank shaft which lat-f ter is the main crank shaft of the'engine.

, Withthe foregoing and other objects in view, my invention consists 1n certain novel features ofconstruction and arrangement "of parts that will, be hereinafter more fully described and claimed and illustrated in the accompanying drawings, wherein Figure 1 is a'vertical longitudinal section taken lengthwise through the center'of an engine of my'improved construction;

Figure 2 is a detail section taken approx imately on the line" 22 of Figure 1;

Figure3 is afdetail section taken approxi- 1 communicates directly with aseriesofinl-et 7 ports 23 that are formed through thewallf- 'of block 10 and which communicatewith the 'mately on the line 33 of Figure 1; V

Figure 4' is a perspectivevi-ew ofthe crank shaft employed in myimproved enmne. x b Referring by numerals to the accompanying drawings, which illustrate a practical embodiment of my invention 10 designates 'a cylinder blockwhich is preferably cast in a single piece and the walls ofwhich are provided with connected chambers 11 through which may" be circulated a fluidcooling medium such as water for the pur- Further objects of my invention are to pose of disseminating the heat generated d-urlng operation oft-he engine.

Formed in the forward portion of the 'block'is a pair .of combined combustion and expansion, chambers 12 and 13, the axes of which are arranged substantially parallel with each other, the chamber 13 being'preferably directly behind and :in line ,with

chamber 12. Formed in the bloclrtothe I rear of and behind chamber 13 is a gaseous fuel pumping chamber14, and formedllin the rear portion of the block preferably. behind said chamber 14 is a piston valve cham-- ber 15 ,7 of relatively small diameter. The: axes of chambers 14 and 15 are. preferably parallefwitheach other andlthey are also preferably inline with orxin the same plane with the axes of 'and13. I a a V Arranged-0n the upper or outerend' of the block 10 is a head'16'provided with con-r combustion chambersh12 nected' chambers 17 through which may be circulated a' fluid-cooling medium and formed in the underlsideof the forward portion of this head is a recess 18 that don nects the combustion chambers 12. and 13 and provides a common combustion and expansion chamber.- i

Seated in head combustion chamber 13 is'an ignition-device such as a' spark plug 19 and the terminals of the electrodes thereof projectinto the common clearance chamber 18-. Formed inthe 16, preferably above the underside of the rearportion of head 1.6 is 1 a relatively shallow recess 20 thatcprovides communication between thechambers14 and 15, and leadingflfroni this chambers. above the pumping-chamber 14'through theside 'of head .16 is'ashort'duct 21, the outer'v end of which communicates with the upper end ofz-an' inclined tubular member22 The lower end of this itubular member intermediate"portion of combustion chamber 13. These ports 23 are arranged so'that they H end of its stroke.

' Formed through the, wallof block: 10 and communicating with the upper portion of the valve chamber 15 1s .a gaseous fuel inlet port 24 that is located sothat'it is fully un "l eo eredQand open only: when the c- .piston Qvalve the lower or inner end of its istrokev" V Formedth oug ithe Wall of block w n communicating "wi h the in ermediate p tion of chamber 12 is .an exhaust port 24? lthat isarrangedso'that it is Wholly uncovsered and open only when the ,pistoneinsaid V chan1ben12'is at the Ioner or inner end of 'ItSSfCI'OkG.

Pistons and'26 are arranged for opera- .j ztion, :lzespectiyely, in combustion ch anihers r 12 and. 13,;and saidipistons are connected by ordm-any COIII1BC1I1QIO1S 27' Withon-e .035 the -throws vor cranks 2810f acrank shaftQQ.

1 wThisCrank shaffit is arranged for operation,

I .l in suitable-hearings that are formedkin i ock 10.1:

the ends of .a crankcase "3l which latter is 'nne'oted sto and anranged b eloiv cylinder A'pumpin'g piston '31 islarranged-for operisaid :pi'stonfvalve to -.a crank 135,011 crank 9" v, V V V V .Fi'sprelferab'ly shorter thanvrthe.cranks 28 and l :33, and "said "crank '35 is karranged' approxi- "f;-1nately;90 in advance oflor'ank-B in the shaft 29" is a"con'necting rod 36. crank irectionoif crank shaft rotation. '"Theoperationof'my llllpI'QYBdfil'lg'lIlG is as ffoblows 2' As piston f -valre '34: r-approachesfand pa'sses low center and :Whii'lejinthe position gaseous fuel.

i illustrated in: IFigure 'l1," ga'seous fuel, inlet jport 24 is opened; thereb -admittin tothe {connectedchambers 14; and 115 a charge of "T'While thefpiston valve is at its low center" the'purnpingippiston 31 isaappr oxiinately lat afihalflway point Lon its downward .or out ward'fistroke, zdue uto t'he position/oat crank :33,- wliilextli-ef power pistons *25Qa11d'26 are at -t-he" l1al if-way point on their upward istrokeskdue to the relative ipositi on 103i crank 11 1326, 7 a yojl ume of residual products: of onrbustionandz-a charge of; gaseous fuel pre- 7 'viously' -tadmittedfto: chamber 13 through j: portsw23. will"he coinpressed the "upper portions-f said chambers 12-andi 13, and

' ithi-n recessx18 andas said cpistons; pass gb; p nterl'orzimmecliately ither'eaite r the -.-con1pressed.chargewill beignited as a result pf -a gspa rk produced "between I the terminals iofi helejlectrodesj of spark plug 19 thereby reducing it relatively high degree :or ex I "-pansion andforcing the pistons downward ontheir poiyerstroke;

As the power pistons approach :and pass itheirolow l oriouter "ce'nt'ers, fexhaust port =24 imlll Vihefainooxrered; thereby permitt ng the Q8. 1' dinning Lfthe upward-trawl of pistons 25 (chamber, a transfer duct extend;

greater portion .of the products of combustion to discharge from the chambers 12 and l and this scavenging action is accelerated V byl the inlet of a compressed gaseous fuel charge through inlet ports123 thature uncovered when p ston 26 reaches its low center. As pistons 25 and 26 start upwali'd on" the charge"compression stroke, the-ports 23 EJ161724 will he closed and the combined charge of residual: products of combustion and-gaseous fuel would be compressed as said pistons travel upwardjin :th e' respectii'e through, port enters h l ;PU;l 1}llng"11l ton 81 .is moving downward through the latter portion of itsoutward "or downward stroke, and as StlCl" ,pumpmg-vzip ston -moves V upward of inward; this chargeoit' gaseou fuel Will he compressed in the upper gpor- :tions of theohainbers 14 and {15, the recess -20 and the duct '22, :but wthischarge of compressed fiuel cannot enter chamber 13 :until the piston 26 therein: reaches the encllogf its .outer or downwardstroke. I

lchamhcrs 12 fandliiiillhe charge loiggaseous i uel;ad1n1tted :to piston valueiichaniher ;.I15' v 7 8o Thus it W111 aloe seen that 131mg i eeideu a;

"two-stroke cycle 1internal coniliustion engine that is of relatively 1 simple structure, 1 cap a lole' of being easily and cheaply produced and which may he very economically operated in point of :fuelconsumption. ll heifour cylinders and 1 their pistons occupy approximately the sarneplane ,and all iofithe pistonsare directly connected sto ;a common crank g-shaft.

One of the particular advantages my iIn-' proved construction is-the prouision'oifaspfis ton valve for controllin jt he admission {of gaseous fuel to the pumping chamber which piston is actuated directly from the crank shaft off the engine.

.Sbvious'ly, the details of i'constr fction of my improved internal combustion engine may bewaried somewhatfnom {those herein 3 [shown and .descri-hed- Without mlepart ui te if'rom" the spirit of myinventiong the scope; ofuylrich xvii ll appear from the appended claim." I claim as my lnventionz 7 In a two stroke cycle vlnternal combustion engine, avcycle having ;a pair of combustion cylinders, a pumping cylinder and a piston '7 valve cylinder, pistons arranged 0 .11

ation Within the combustion cyl nders and pumping cylinder, a piston valuear ang for operation Within the. pjistqni ialye [cylinder, the spair of combustion cyilinderfichaln 1 0 7 hers jheing joined lat'the :headsend by a cominon compression and combustion clearance chamber, the pumping cylinder Lohamher and the p1ston Valvecyhn'der eharnher'bemg joined .a common compress on elearance Home the clearance chamber of the pumping and pis-' "ton valve-cylinder to ports formed in the intermediate portion of fone of the pair .of

combustion cylinders the aO'f all of the cylinders being Substantially parallel and ing separately connected to one of the crank throws of said three crank throw shaft, the piston Within the pumping cylinder being connected to a second crank throw of said three throw crankshaft, the piston valve 7 within the valve cylinder, being connected to the third crank throw of the said three crank throw crank shaftflthe degree of an gularity between the crank to which the two combustion cylinder pistons are connected and the crank to which the piston of the pumping cylinder is connected, being such, as to cause the piston within the pump Y cylinder to reach compression dead center as'the, piston within the combustion cylinder in which the inlet ports of the transfer duct are formed, has closed the said inlet ports u and the crank to which the piston valve is connected, being spaced circuinferentia-lly in degrees in relation to .the crank to which the nectedso asv to cause the inlet function by the said piston valve to the said pumping cylinder, to be eiiected during the entire piston'within the pumping cylinder is conperiod of the suction stroke off the pumping piston wlth the desired lag in valveclosing timing.

In tes-timonywhereoit' I affix my signature.

EVERETT R. BURTNETTQ 

